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Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field

A technology of microbial metabolism and micro-electric field, which is applied in the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of continuous treatment, avoid sewage and waste gas, improve leaching efficiency, and shorten the process flow.

Inactive Publication Date: 2011-10-05
CHANGZHOU TEXTILE GARMENT INST
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Problems solved by technology

However, there is an Achilles' heel that cannot be processed continuously, and generally adopts one-stage and two-stage processing methods

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  • Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field
  • Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field
  • Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] A method for continuous recycling of copper in circuit boards by microbial metabolites under the action of a micro-electric field (combined with figure 1 shown), the principle is to install a number of micro-electrodes inside the microbial reactor to generate a number of micro-electric field units. Under a certain electric field strength, the growth of microorganisms is promoted, and the heavy metal ions in the reaction system are electrolytically adsorbed on the cathode. Reduce the heavy metal content in the system, prevent microorganisms from being inhibited by heavy metals, and collect metals on the cathode, killing two birds with one stone. This method is different from the ordinary two-stage leaching method. It adds a micro-electric field to the key part of recovery to provide additional energy to the system, promote microbial metabolism, a...

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Abstract

The invention relates to a method for treating waste printed circuit boards (PCB), in particular to a method for continuously recovering copper from circuit boards by microbial metabolites under the action of a micro electric field. The method comprises the following steps of: (1) acquiring acidophilic bacteria; (2) performing scale-up culture on the acidophilic bacteria in a 9K culture medium toobtain bacterial liquid; (3) crushing the waste PCBs; (4) adding printed circuit board powder into a microbe reactor containing the bacterial liquid; (5) applying a 10-20mA micro electric field to the microbe reactor; (6) recovering metals on negative poles; and (7) recovering the residual non-metals. The method has all advantages of microbiohydrometallurgy, and the concentration of heavy metal ions in a microbe living system can be changed, so that the bioreaction can be continuously performed; therefore, the whole process flow is shortened, the cost is saved, sewage and waste gas are avoided, and the microbiological leaching efficiency is improved.

Description

Technical field: [0001] The invention relates to a method for processing waste circuit boards (PCBs), in particular to a method for continuously recovering copper in circuit boards from microbial metabolites under the action of a micro-electric field. Background technique: [0002] At present, there are many methods for processing PCBs, which are generally divided into the following categories: pyrometallurgy, hydrometallurgy, mechanical treatment, and microbial methods. [0003] Pyrometallurgy and hydrometallurgy are mainly used for the recovery of precious metals such as gold and silver. The process is simple, but the cost is high and the secondary pollution is serious, especially for the recovery of common metals. Although the mechanical separation process is more complicated than pyrometallurgy and hydrometallurgy, its secondary pollution is small. Therefore, the comprehensive utilization of various metals in waste printed circuit boards has high use value. However, sin...

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Application Information

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IPC IPC(8): C22B3/18C25C1/12C22B7/00C22B15/00
CPCY02P10/20
Inventor 曹侃李登新杨蕴敏许良英
Owner CHANGZHOU TEXTILE GARMENT INST
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